<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>index</title>
</head>
<body>
    index.......
    <script>
        let user = {
            name: 'jack',
            age: 20
        }
        console.log(user.name);
        console.log(user.age);

    </script>
</body>
</html>